scholarly journals Roughing Milling with Ceramic Tools in Comparison with Sintered Carbide on Nickel-Based Alloys

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 734
Author(s):  
Pablo Fernández-Lucio ◽  
Octavio Pereira Neto ◽  
Gaizka Gómez-Escudero ◽  
Francisco Javier Amigo Fuertes ◽  
Asier Fernández Valdivielso ◽  
...  
Keyword(s):  
Cutting Speed ◽  
High Volume ◽  
Cemented Carbide ◽  
Performance Ratio ◽  
Cost Performance ◽  
Ceramic Tools ◽  
The Cost ◽  
Engine Components ◽  
Coated Carbide ◽  
Milling Tools

Productivity in the manufacture of aircrafts components, especially engine components, must increase along with more sustainable conditions. Regarding machining, a solution is proposed to increase the cutting speed, but engines are made with very difficult-to-cut alloys. In this work, a comparison between two cutting tool materials, namely (a) cemented carbide and (b) SiAlON ceramics, for milling rough operations in Inconel® 718 in aged condition was carried out. Furthermore, both the influence of coatings in cemented carbide milling tools and the cutting speed in the ceramic tools were analysed. All tools were tested until the end of their useful life. The cost performance ratio was used to compare the productivity of the tested tools. Despite the results showing higher durability of the coated carbide tool, the ceramic tools presented a better behavior in terms of productivity at higher speed. Therefore, ceramic tools should be used for higher productivity demands, while coated carbide tools for low speed-high volume material removal.

Aspects of Improving the Cost-Performance Ratio for the Manufacturing of Small-Size Cast Parts

2010 ◽  
Vol 43 (17) ◽  
pp. 349-354
Author(s):  
Cristian Deac ◽  
Melania Tera ◽  
Cristina Biris ◽  
Marius Bibu ◽  
Valentin Oleksik
Keyword(s):  
Performance Ratio ◽  
Cost Performance ◽  
The Cost ◽  
Cast Parts

scholarly journals Key Parameters in the Manufacture of SiC-Based Composite Materials by Reactive Melt Infiltration

2019 ◽  
Author(s):  
Mario Caccia ◽  
Javier Narciso
Keyword(s):  
Composite Materials ◽  
Dwell Time ◽  
Performance Ratio ◽  
Cost Performance ◽  
Vacuum Atmosphere ◽  
Protection Systems ◽  
Melt Infiltration ◽  
The Cost ◽  
Reactive Melt Infiltration ◽  
Reactive Melt

The manufacture of SiC-based composites is quite widespread, and currently different methods are employed for to produce them. The most efficient method, taking into account the cost/performance ratio, is reactive melt infiltration. It consists in infiltrating liquid silicon into a porous preform that must contain carbon, so that SiC is produced during infiltration. This chemical reaction is, in fact, the driving force of the process. In the present work, the synthesis of two SiC-based composite materials with very different applications and microstructures has been studied and optimized. In both cases, materials have been obtained with suitable properties for the selected applications. One of the materials studied is SiCp/Si for protection systems such as armor jackets, and the other one is Cf/SiC for use in braking systems. For the optimization, the dwell time and the atmosphere (Ar or primary vacuum) were used as variables. It has been found that in both preforms the optimum conditions are 1 hour dwell time and a vacuum atmosphere at 1450 °C. The effect of these parameters on microstructure and infiltration kinetics are discussed.

scholarly journals Assessment of the Usefulness of Observation and Tracking Heads of the Long-Range for the Stratospheric Aerostat Recognition System

2018 ◽  
Vol 9 (4) ◽  
pp. 163-176
Author(s):  
Paweł DOBRZYŃSKI ◽  
Mariusz KRAWCZAK ◽  
Stanisław LIPSKI ◽  
Bogdan MACHOWSKI
Keyword(s):  
Long Range ◽  
Armed Forces ◽  
Recognition System ◽  
Performance Ratio ◽  
Cost Performance ◽  
Technical Parameters ◽  
Intelligence Collection ◽  
Operational Capabilities ◽  
The Cost ◽  
Production And Operation

The paper presents the problems of applications of stratospheric systems to increase the tactical and reconnaissance capabilities of the Polish Armed Forces. The paper contains the results from examples of simulations which were designed to determine the cost/performance ratio of the production and operation of aerostats with strictly identified technical parameters in the context of their operational capabilities. It also describes the principles of operation of aerostats for the support of intelligence collection and the limitations imposed on aerostats by the specificity of tropospheric and stratospheric regions.

Solutions for Wafer-Level Packaging of High Brightness LEDs

2011 ◽  
Vol 2011 (DPC) ◽  
pp. 001418-001442
Author(s):  
Thomas Uhrmann ◽  
B. Kim ◽  
T. Matthias ◽  
P. Lindner
Keyword(s):  
Form Factor ◽  
Light Output ◽  
High Volume ◽  
Performance Ratio ◽  
High Yield ◽  
Light Sources ◽  
Wafer Level ◽  
Process Step ◽  
High Brightness ◽  
The Cost

High brightness LEDs (HB-LEDs) carry a high prospect for general lighting applications. Competing with the cost/performance ratio of current light sources demands an increase of the overall efficiency as well as the reduction of the device cost. Since packaging accounts for 30%–50% of the cost of HB LED manufacturing, moving from die- level to wafer-level processes is one likely potential solution for reducing cost per lumen. Silicon-based WLP, using the established processing technology of the MEMS and IC industry, offers high fabrication reliability, high yield and the direct integration of the driver IC in the package. The already small form factor of WLP can be further reduced using Through-Silicon-Vias (TSV), increasing the maximum amount of chips per wafer. Silicon WLP also offers superior thermal management, with the relatively high thermal conductance of silicon. Redistributing LED dies on silicon wafer submounts, with metal bonding and copper TSVs, further improves the heat conductance away from the active region of the chip, resulting in increased device performance. Wafer-level optics can further improve performance and reduce packaging costs. Wafer-level lens molding based on imprint lithography is in high volume manufacture for cell phone camera modules. It allows creation of spherical and a-spherical lenses as well as lens stacks with minimized form factor. In contrast to the currently applied drop dispensing technique for LED lens fabrication, the shape of the lens can be accurately tailored and the decrease of the lens size results in lower absorption and higher light output. Most of these technologies are already in high volume production in other sectors. We will discuss the field proven solutions at each process step, from the formation of the silicon interposer, through the chip-to-wafer bonding, to the final imprinting of the wafer-level optics.

scholarly journals PROCESSING OF DUROPLASTICS

2005 ◽  
Vol 11 (2) ◽  
pp. 115-122
Author(s):  
Friedhelm Pracht
Keyword(s):  
High Temperatures ◽  
High Stability ◽  
Performance Ratio ◽  
Process Technology ◽  
Cost Performance ◽  
Building Technology ◽  
Main Emphasis ◽  
The Cost

Duroplastics are used in the building technology, as well as in other important technical components. If high stability of the form is demanded in connection with high temperatures, there are still possible fields of application for duroplastics particularly if the main emphasis is on the cost‐performance ratio, compared with thermoplastics which are becoming more and more important today. This article is about duroplastics and their process technology. Some examples of the use of duroplastics are: installation material such as switches and sockets, ashtrays for automobiles and in sanitation: toilet covers.

Development of a New 300kv Ultra-High-Resolution/High Performance Analytical TEM (H-9000)

1985 ◽  
Vol 43 ◽  
pp. 142-143
Author(s):  
H. Fujita ◽  
K. Ura ◽  
H. Sata ◽  
K. Miyauchi ◽  
T. Onai ◽  
...  
Keyword(s):  
High Resolution ◽  
Full Advantage ◽  
Diffraction Pattern ◽  
High Voltage ◽  
High Performance ◽  
Performance Ratio ◽  
General View ◽  
Lens System ◽  
Cost Performance ◽  
The Cost

Higher voltage is advantageous for better imaging resolution, better EELS performance and easier microscopy. Generally it results in a large scaled instrument with many associated problems. In the analytical area, there is a possibility of optimum voltage when a total performance balance is taken in consideration. We have developed a 300 KV TEM for both ultra high resolution and high performance analytical applications in view of these parameters. We have suceeded in making the instrument as compact as possible in order that it may improve the cost/performance ratio. We have taken full advantage of our ultra high voltage microscope experiences.Fig. 1 is a general view of the instrument. It is only 2.68m high and the same as conventional 200KV instruments. It consists of a 3-stage illumination and a 5-stage imaging lens system. This design allows the orientation matching for the diffraction pattern and TEM image throughout the entire magnification range.

Surface Integrity in MQL Drilling Nickel-Based Superalloy

2010 ◽  
Vol 447-448 ◽  
pp. 811-815 ◽  
Author(s):  
Erween Abdul Rahim ◽  
Hiroyuki Sasahara
Keyword(s):  
Surface Integrity ◽  
High Reliability ◽  
Cutting Speed ◽  
Machined Surface ◽  
Jet Engine ◽  
Synthetic Ester ◽  
Nickel Based Superalloy ◽  
Surface Damages ◽  
Engine Components ◽  
Coated Carbide

Nickel-based superalloys remain the most widely used of all materials in aerospace industry, contributed over 50 % of the weight of a jet engine. In machining of any jet engine components, it is necessary to satisfy the surface quality or surface integrity requirements to facilitate high reliability components. In the present study, surface integrity of Inconel 718 was studied when drilling under different lubricants. The holes were drilled individually using indexable AlTiN coated carbide drill under minimum quantity of lubricant (MQL) conditions. The results demonstrated that the machining conditions and lubricants strongly influence the surface integrity. The surface roughness decreases with the increase in cutting speed and increases with the increase in feed rate. Microhardness profiles indicated that the subsurface deformation extends up to a 100 and 150 μm for palm oil and synthetic ester, respectively underneath the machined surface. Pit holes, cavities, grooves, microcracks and surface smearing were the dominant surface damages criteria for all cases.

Cutting Performance of Ceramic Tools in Turning of Mild Steel

2012 ◽  
Vol 523-524 ◽  
pp. 493-496 ◽  
Author(s):  
Ryutaro Tanaka ◽  
Akira Hosokawa ◽  
Tatsuaki Furumoto ◽  
Takashi Ueda
Keyword(s):  
Mild Steel ◽  
Tool Life ◽  
Cutting Speed ◽  
Alumina Ceramic ◽  
Cutting Performance ◽  
The Other ◽  
Ceramic Tool ◽  
Ceramic Tools ◽  
Coated Carbide ◽  
Standard Steel

This study deals with the cutting performance of ceramic tools in turning of mild steel and BN free-machining steel based on it. The tool lives of ceramic tools in turning standard steel were less than 15 min at the cutting speed 250 m/min. On the other hand, the tool lives in turning of BN free-machining steel were obvious longer than that of standard steel. The tool life of TiC added alumina ceramic tool reached almost 10 hours in the case that the tool life criteria was set at VB=0.3mm. This tool life was twice as long as that of coated carbide tool.

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